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| author |   Xiangliang Yu <Xiangliang.Yu@amd.com> | 2015-12-11 20:02:53 +0800 |
|---|---|---|
| committer |   Wolfram Sang <wsa@the-dreams.de> | 2015-12-12 18:00:16 +0100 |
| commit | 2d244c81481fa5142a2ba6656ab7a8e40c849c27 (patch) | |
| tree | febadcdd309a628e2f002b31bb8bbc667704d1a0 /drivers/i2c/busses/i2c-designware-core.h | |
| parent | i2c: imx: init bus recovery info before adding i2c adapter (diff) | |
| download | linux-dev-2d244c81481fa5142a2ba6656ab7a8e40c849c27.tar.xz linux-dev-2d244c81481fa5142a2ba6656ab7a8e40c849c27.zip | |
i2c: designware: fix IO timeout issue for AMD controller
Because of some hardware limitation, AMD I2C controller can't
trigger pending interrupt if interrupt status has been changed
after clearing interrupt status bits. Then, I2C will lost
interrupt and IO timeout.
According to hardware design, this patch implements a workaround
to disable i2c controller interrupt and re-enable i2c interrupt
before exiting ISR.
To reduce the performance impacts on other vendors, use unlikely
function to check flag in ISR.
Signed-off-by: Xiangliang Yu <Xiangliang.Yu@amd.com>
Acked-by: Jarkko Nikula <jarkko.nikula@linux.intel.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
Cc: stable@kernel.org
Diffstat (limited to 'drivers/i2c/busses/i2c-designware-core.h')
| -rw-r--r-- | drivers/i2c/busses/i2c-designware-core.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/i2c/busses/i2c-designware-core.h b/drivers/i2c/busses/i2c-designware-core.h index 1d50898e7b24..9ffb63a60f95 100644 --- a/drivers/i2c/busses/i2c-designware-core.h +++ b/drivers/i2c/busses/i2c-designware-core.h @@ -111,6 +111,7 @@ struct dw_i2c_dev { #define ACCESS_SWAP 0x00000001 #define ACCESS_16BIT 0x00000002 +#define ACCESS_INTR_MASK 0x00000004 extern int i2c_dw_init(struct dw_i2c_dev *dev); extern void i2c_dw_disable(struct dw_i2c_dev *dev); |